You should assume that all doors with double-pane glass ... is filled with air or with a gas, usually argon or krypton. It is this sealed space that gives the window most of it's thermal performance.

All of the windows in our current ratings are double-paned, with the space in between filled with insulating argon gas. Our tests have found that the material a window frame is made of doesn’t ...

If it’s single-pane glass, it will feel cold. If it’s double- or ... or an inert gas like argon or neon. That layer of air or gas does the insulating. “Insulated windows act as effective ...

Alderfer Glass, a window repair and replacement expert, is helping homeowners understand the causes of this issue and ...